Y Combinator Winter 2026 (W26) Companies

Copperlane builds an interface layer between borrowers and loan officers to streamline the mortgage application process. The platform addresses inefficiencies in home purchasing for first-time homebuyers, families, and immigrants by handling document collection, information coordination, and status clarity.

2 investors

Corelayer provides AI-powered incident detection and root-cause analysis for production environments, using agents to proactively identify and prevent infrastructure issues for engineering teams. The platform integrates with observability tools, cloud providers, and incident response systems while maintaining data security through on-premises or customer-controlled cloud deployment.

1 investor

Corvera builds a context layer for AI-native consumer packaged goods (CPG) brands that unifies existing brand data and makes it accessible to AI tools via MCP protocol.

1 investor

Crosslayer Labs provides cybersecurity solutions that discover, analyze, and monitor network infrastructure vulnerabilities across multiple layers to protect HTTPS websites and APIs from attacks. The platform serves healthcare, fintech, banking, and cryptocurrency organizations with attack surface discovery, security analytics, and ongoing threat monitoring.

1 investor

Crow provides AI tools for the commercial real estate industry.

1 investor

Cumulus Labs provides an inference platform that consolidates production AI infrastructure (routing, caching, observability, evaluation, fine-tuning, and runtime) into a single API. The platform serves AI teams building production applications across any model provider or framework.

1 investor

Didit provides identity verification and KYC/KYB infrastructure for organizations worldwide, offering a programmable API with real-time fraud detection, deepfake protection, and support for 48+ languages. The platform is designed for regulated financial institutions, marketplaces, and access-control systems.

3 investors

Ditto Bio uses AI to identify protein candidates from parasites and pathogens for treating autoimmune diseases. The company mines natural compounds from viruses, ticks, and worms whose immune-modulating properties have evolved over millions of years.

1 investor

Docura Health provides software for physicians to organize medical records, prepare med-legal reports, and review case files with reduced administrative burden. The platform serves physicians involved in medical-legal work and emphasizes HIPAA compliance and security.

1 investor

Doomersion provides language learning through short-form videos matched to the learner's proficiency level. The platform gamifies language acquisition by integrating educational content into the social media consumption experience.

1 investor

EigenPal provides AI automation that learns business workflows from user-provided examples and automatically processes documents like mortgages, insurance claims, and invoices with high accuracy. The platform serves enterprise customers in finance, insurance, manufacturing, and healthcare, offering document processing and workflow automation with deployment options across major cloud providers.

1 investor

Emdash is an open-source development environment for running coding agents in parallel with task scheduling and diff review capabilities. It supports multiple agent types and works across macOS, Windows, and Linux.

1 investor

End Close provides automatic transaction reconciliation for high-volume payment companies using deterministic rules and AI agents to match transactions, investigate exceptions, and enable continuous compliance reporting. The platform integrates with payment processors, banks, and internal systems via APIs and webhooks to automate month-end close processes for fintech and payments operations teams.

1 investor

Envariant builds an interpretability SDK that enables teams to inspect, steer, and control the behavior of foundation models, addressing issues like hallucinations and output brittleness in complex domains. The platform moves model verification into latent space and provides tools to detect behaviors, reason about outputs, and generate edge cases.

1 investor

Eos is a healthcare data integration platform that connects disconnected clinical and operational systems (EHRs, imaging, labs, scheduling, billing) to create unified patient records while keeping data in original systems. The platform resolves patient identities across sites and encounters for healthcare organizations.

1 investor

Fed10 uses AI agents to track legislation across U.S. jurisdictions and alert clients to bills that could affect their business, delivering analysis that would traditionally require a policy consultant. The company was founded by former lobbyists.

1 investor

Fenrock AI develops AI agent software designed for banks and other traditional financial institutions to improve their operations and business models.

2 investors

Fern develops high-fidelity, custom robot world models for scaling the evaluation and training of robot policies. The product serves robotics teams building and deploying autonomous systems.

1 investor

Fixture is an AI-first CRM platform designed for startups that aggregates customer interactions into a structured activity graph and provides AI-suggested next steps. It serves revenue and operations teams through APIs and MCP integration, with a keyboard-first interface accessible from the terminal.

1 investor

Foreman provides an all-in-one platform for contractors to manage projects, invoicing, proposals, and documentation without spreadsheets. The platform automates project monitoring, takeoff calculations, cost breakdowns, e-signatures, online payments, and scheduling with critical path analysis for construction projects.

1 investor

Fort makes strength training wearable devices. The company is backed by investors from OpenAI and Tesla.

2 investors

Forum operates an exchange for trading attention-based assets, measuring engagement across search, social, and streaming to create indices that track cultural popularity and allow users to go long or short on attention signals for films, artists, games, brands, and topics.

2 investors

FullSeam provides AI agents that autonomously manage accounts receivable, accounts payable, cash application, and reconciliation tasks for finance teams. The platform integrates with existing ERP systems and financial software to automate manual finance operations.

1 investor

GRU Space develops technology for human habitation on the Moon and Mars. The company focuses on enabling humanity's transition to an interplanetary species through solutions for off-world settlement.

4 investors